Rotary pump



July 9, 1946. D. WITTENBERG ROTARY PUMP:

I Filed Sept. 1, 1944 0M0 MTTf/VEEEG Patented July 9, 1946 uNiTEo STATES PATENT orrica ROTARY PUMP David Wittenberg, Romema, Jerusalem,

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Application September 1, 1944, Serial No. 552,227 In Palestine August 31, 1943 or gas contained in the tube in front of the rotating rol er or eccentric *disc is pressed in the direction of rotationjand at the same time the tube portions behind the rotating member reassume, owing to their resiliency, their original shape and volume and suck in fresh fluid. The fluid flows without interruption and no check valve need to be provided to prevent any reflux, since the tube is always compressed at one point.

The new pump ofiers several important advantages. There is no piston or rotor moving within the liquid pumped, it has the appearance of the known rotary pump, but has no stufilng boxes for a piston rod or rotor shaft and corrosive liquids or gases can be easily handled without any protective coating hitherto used for the piston or rotor.

The invention is illustrated in the annexed drawing, wherein,

Fig. 1 is an elevational view of the pump; Fil ig. 2 is a vertical section on the line IIII of Fig. 3 and Fig. 4 show constructional details on a larger scale.

The new pump comprises a rubber tube I bent into a coil with preferably slightly more than one turn only. The coil is accommodated in an iron cylinder 2 with cast short intake and outlet pipes 3, 4. The coil is held in the cylinder by projecting with its ends into the pipes 3, 4. Cylinder 2 is closed at one end by a screwed on cover 5, and is attached at the other end to the flange 6 of a shaft bearing I forming part of a pedestal I. In the bearing 1 is'journalled a shaft 9 projectin with one end into the tube coil, where it has keyed thereto an'eccentric disc ID. The outer end of shaft 9 may be coupled to an electromotor or transmission.

To reduce the friction otherwise occurring between the rotating eccentric and the tube, a metallic ring H is arranged on the circumference of the eccentric which rolls upon the flattenedtubewhilethe eccentric rotates within. the ring. The metallic ring ll flts tightly into the inner space of the coil so that the wear of the 2 pipe by the rotation of the eccentric is completely eliminated. The width of the ring is approximately the same as that of the cylinder 2.

For further reducing the friction between the ring II and the tube-coil, the ring H is provided with a pin l2 engaging into a slot of a bar I! pivoted by means of another pin it to an eye I! of the casing 2. While the eccentric 1S rotating pin 1! slides in the slot and the bar l3 oscillates about its pivot and prevents ring H from rotating. Thus no relative movement takes place between the contacting surfaces of the ring I l and the tube. Tube I may be provided with prolecq tions or buttons l6 fitting into corresponding depressions or the ring II, thus wholly preventing turn, a cylindrical casing in which this coil is fixed, an eccentric disk rotatable within the coil. and a metallic ring inserted between the eccentric and the coil, the coil being provided "with projections fitting into recesses of the said eecentric disk being adapted, by means of said ring, to compress said tube progressively and continuously through an angle of 360 with elimination, by said ring, of friction between said diskand tube.

2. A rotary pump comprising a resilient tube of circular cross section, bent into a helical coil having slightly more than one full turn and having side lines parallel to its axis thronghout'its length, a cylindrical casing, in which this coil is fixed, an eccentric disk rotatable within the coil,

and a metallic ring inserted between the eccen-' angle of 360 with elimination, by said ring, of

friction between said disk and said tube. 

